Unbiased Expectations Theory Suppose that the current one year rate (one-year spot rate) and expected one-year T-bill rates over the following three years (e years 2, 3 and 4. respectively) are as follows: 70-4.40% 527) 5.40% E37)=5,90%, E471-6.25% Using the unbiased expectations theory, what is the current long term) rate for four-year-maturity Treasury securities